linux-kernel - Re: [PATCH 07/10] perf sort: Check return value of strdup()

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Date:	Fri, 11 Jan 2013 02:17:45 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung.kim@....com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 07/10] perf sort: Check return value of strdup()

Em Thu, Dec 27, 2012 at 06:11:44PM +0900, Namhyung Kim escreveu:
> From: Namhyung Kim <namhyung.kim@....com>
> 
> When setup_sorting() is called, 'str' is passed to strtok_r() but it's
> not checked to have a valid pointer.  As strtok_r() accepts NULL
> pointer on a first argument and use the third argument in that case,
> it can cause a trouble since our third argument, tmp, is not
> initialized.

Ok, but calling exit from here? Better to check it at the callers and
propagate the error, letting things like TUI/gui exit routines to
execute.
 
> Cc: Stephane Eranian <eranian@...gle.com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/util/sort.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
> index c02964cabdd0..9f827e25a2b5 100644
> --- a/tools/perf/util/sort.c
> +++ b/tools/perf/util/sort.c
> @@ -552,6 +552,11 @@ void setup_sorting(const char * const usagestr[], const struct option *opts)
>  {
>  	char *tmp, *tok, *str = strdup(sort_order);
>  
> +	if (str == NULL) {
> +		error("Not enough memory to setup sort keys");
> +		exit(-1);
> +	}
> +
>  	for (tok = strtok_r(str, ", ", &tmp);
>  			tok; tok = strtok_r(NULL, ", ", &tmp)) {
>  		if (sort_dimension__add(tok) < 0) {
> -- 
> 1.7.11.7
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